Today Google freshened up their Search page, as noted in their official blog. In conjunction, they also added some neat features to Google Mobile Search. Not only did they streamline the look, they added the “Advanced Options” from desktop search. Just click the little blue button next to the search box. Now your mobile and desktop experiences more closely mirror each other.
When you go to Google.com in the US on your iPhone or Android-powered device, and enter a search, you can now tap on the button to the left of the search box on the results page to see a new search options menu. Then, selecting any item in the menu will refine your search. For example, if you are looking for recent results for “Mother’s day gift”, simply tap the “Past week” option.
Source: Google Mobile Blog